You can get a more desirable domain name of your choice due to its relatively low amount co.cc domains. This can greatly help you in ranking top results in search engines, because having a keyword rich domain name is key.

Hi Dan Bro , This is Arjun again , but this time for giving some advice , as you are telling people about co.cc thing , so You can actually earn from this by becoming affiliate of them & edit this post & post there banner or link you have got

Personally, I would stick with the Blogger blogspot.com as these free domain sites have a tendency to not always be working right all the time. If co.cc has problems, it will affect people trying to access your blog.